program: mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./config\x00', 0x1ff) mount(0x0, &(0x7f0000000000)='./config\x00', &(0x7f0000000040)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./config/target\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./config/target/core\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/target/core/rd_mcp_0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./config/target/core/rd_mcp_0/rd1\x00', 0x1ff) r0 = openat(0xffffffffffffff9c, &(0x7f0000000180)='./config/target/core/rd_mcp_0/rd1/control\x00', 0x2, 0x0) write(r0, &(0x7f00000001c0)='rd_pages=32768\x00', 0xe) r1 = openat(0xffffffffffffff9c, &(0x7f0000000200)='./config/target/core/rd_mcp_0/rd1/enable\x00', 0x2, 0x0) write(r1, &(0x7f0000000240)='1\x00', 0x1) mkdirat(0xffffffffffffff9c, &(0x7f0000000280)='./config/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000002c0)='./config/usb_gadget/g1\x00', 0x1ff) r2 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./config/usb_gadget/g1/idVendor\x00', 0x2, 0x0) write(r2, &(0x7f0000000340)='0x1d6b\x00', 0x6) r3 = openat(0xffffffffffffff9c, &(0x7f0000000380)='./config/usb_gadget/g1/idProduct\x00', 0x2, 0x0) write(r3, &(0x7f00000003c0)='0x0104\x00', 0x6) mkdirat(0xffffffffffffff9c, &(0x7f0000000400)='./config/usb_gadget/g1/functions\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./config/usb_gadget/g1/functions/tcm.0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000480)='./config/usb_gadget/g1/configs\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000004c0)='./config/usb_gadget/g1/configs/c.1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000540)='./config/target/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000580)='./config/target/usb_gadget/naa.6001405123456789\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000005c0)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000600)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000640)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0\x00', 0x1ff) symlinkat(&(0x7f0000000140)='./config/target/core/rd_mcp_0/rd1\x00', 0xffffffffffffff9c, &(0x7f0000000680)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0/rd1\x00') symlinkat(&(0x7f0000000440)='./config/usb_gadget/g1/functions/tcm.0\x00', 0xffffffffffffff9c, &(0x7f0000000500)='./config/usb_gadget/g1/configs/c.1/tcm.0\x00') r4 = openat(0xffffffffffffff9c, &(0x7f00000006c0)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/nexus\x00', 0x2, 0x0) write(r4, &(0x7f0000000700)='naa.6001405123456789\x00', 0x14) r5 = openat(0xffffffffffffff9c, &(0x7f0000000740)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/enable\x00', 0x2, 0x0) write(r5, &(0x7f0000000780)='1\x00', 0x1) r6 = openat(0xffffffffffffff9c, &(0x7f00000007c0)='./config/usb_gadget/g1/UDC\x00', 0x2, 0x0) write(r6, &(0x7f0000000800)='dummy_udc.0\x00', 0xb) nanosleep(&(0x7f0000000840)={0x1}, 0x0) r7 = syz_open_dev$sg(0x0, 0x0, 0x0) write(0xffffffffffffffff, &(0x7f00000008c0)='\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\b\x00\x00\x00\x00\x00\x00\x00', 0x1c) ioctl$SG_IO(r7, 0x2285, &(0x7f0000000880)={0x53, 0xfffffffe, 0xa, 0x0, @buffer={0x0, 0x1c, &(0x7f00000008c0)=""/28}, &(0x7f0000000900)="5f000000000000001c00", &(0x7f0000000940), 0x0, 0x0, 0x0, 0x0}) [ 99.942102][ T5285] Bluetooth: hci0: command tx timeout [ 100.035787][ T24] audit: type=1800 audit(1785849952.587:2): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4257 res=0 errno=0 [ 100.058556][ T24] audit: type=1800 audit(1785849952.607:3): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4264 res=0 errno=0 [ 100.080726][ T5321] se_device not configured yet, cannot port link [ 100.083787][ T24] audit: type=1800 audit(1785849952.607:4): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4265 res=0 errno=0 [ 100.099688][ T5321] [ 100.100742][ T5321] ====================================================== [ 100.103493][ T5321] WARNING: possible circular locking dependency detected [ 100.106323][ T5321] syzkaller #0 Not tainted [ 100.108132][ T5321] ------------------------------------------------------ [ 100.110951][ T5321] syz.0.0/5321 is trying to acquire lock: [ 100.112888][ T5321] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 100.116062][ T5321] [ 100.116062][ T5321] but task is already holding lock: [ 100.118808][ T5321] ffff888012c88390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 100.122158][ T5321] [ 100.122158][ T5321] which lock already depends on the new lock. [ 100.122158][ T5321] [ 100.126116][ T5321] [ 100.126116][ T5321] the existing dependency chain (in reverse order) is: [ 100.129453][ T5321] [ 100.129453][ T5321] -> #3 (&gi->lock){+.+.}-{4:4}: [ 100.132133][ T5321] __mutex_lock+0x19d/0x1550 [ 100.134019][ T5321] config_usb_cfg_link+0x59/0x260 [ 100.136150][ T5321] configfs_symlink+0x59a/0x1030 [ 100.138183][ T5321] vfs_symlink+0x18b/0x330 [ 100.140070][ T5321] filename_symlinkat+0x1cd/0x410 [ 100.142132][ T5321] __se_sys_symlinkat+0x4e/0x2b0 [ 100.144218][ T5321] do_syscall_64+0x174/0x580 [ 100.146118][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.148522][ T5321] [ 100.148522][ T5321] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 100.151728][ T5321] down_write+0x96/0x200 [ 100.153469][ T5321] configfs_depend_item_unlocked+0x153/0x420 [ 100.155844][ T5321] usbg_make_tpg+0x1f6/0x590 [ 100.157912][ T5321] target_fabric_make_tpg+0xa8/0x6d0 [ 100.160308][ T5321] configfs_mkdir+0x4f6/0x9e0 [ 100.162265][ T5321] vfs_mkdir+0x406/0x620 [ 100.164217][ T5321] filename_mkdirat+0x285/0x510 [ 100.166369][ T5321] __se_sys_mkdirat+0x35/0x150 [ 100.168522][ T5321] do_syscall_64+0x174/0x580 [ 100.170584][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.173196][ T5321] [ 100.173196][ T5321] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 100.175912][ T5321] __mutex_lock+0x19d/0x1550 [ 100.177687][ T5321] usbg_make_tpg+0x147/0x590 [ 100.179419][ T5321] target_fabric_make_tpg+0xa8/0x6d0 [ 100.181493][ T5321] configfs_mkdir+0x4f6/0x9e0 [ 100.183573][ T5321] vfs_mkdir+0x406/0x620 [ 100.185414][ T5321] filename_mkdirat+0x285/0x510 [ 100.187320][ T5321] __se_sys_mkdirat+0x35/0x150 [ 100.189242][ T5321] do_syscall_64+0x174/0x580 [ 100.191305][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.193803][ T5321] [ 100.193803][ T5321] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 100.196927][ T5321] __lock_acquire+0x1520/0x2cf0 [ 100.199017][ T5321] lock_acquire+0x106/0x350 [ 100.201011][ T5321] __mutex_lock+0x19d/0x1550 [ 100.203427][ T5321] tcm_alloc+0x21/0x2e0 [ 100.205738][ T5321] usb_get_function+0x63/0xb0 [ 100.208225][ T5321] config_usb_cfg_link+0x148/0x260 [ 100.210529][ T5321] configfs_symlink+0x59a/0x1030 [ 100.212698][ T5321] vfs_symlink+0x18b/0x330 [ 100.214742][ T5321] filename_symlinkat+0x1cd/0x410 [ 100.216967][ T5321] __se_sys_symlinkat+0x4e/0x2b0 [ 100.219167][ T5321] do_syscall_64+0x174/0x580 [ 100.221263][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.223795][ T5321] [ 100.223795][ T5321] other info that might help us debug this: [ 100.223795][ T5321] [ 100.227407][ T5321] Chain exists of: [ 100.227407][ T5321] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 100.227407][ T5321] [ 100.233121][ T5321] Possible unsafe locking scenario: [ 100.233121][ T5321] [ 100.236172][ T5321] CPU0 CPU1 [ 100.238383][ T5321] ---- ---- [ 100.240572][ T5321] lock(&gi->lock); [ 100.242187][ T5321] lock(&sb->s_type->i_mutex_key#24); [ 100.245445][ T5321] lock(&gi->lock); [ 100.248023][ T5321] lock(tpg_instances_lock); [ 100.249707][ T5321] [ 100.249707][ T5321] *** DEADLOCK *** [ 100.249707][ T5321] [ 100.252930][ T5321] 3 locks held by syz.0.0/5321: [ 100.255004][ T5321] #0: ffff888000318450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 100.258680][ T5321] #1: ffff888044247a40 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 100.263039][ T5321] #2: ffff888012c88390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 100.266804][ T5321] [ 100.266804][ T5321] stack backtrace: [ 100.269245][ T5321] CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 100.269261][ T5321] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 100.269269][ T5321] Call Trace: [ 100.269277][ T5321] [ 100.269283][ T5321] dump_stack_lvl+0xe8/0x150 [ 100.269304][ T5321] print_circular_bug+0x2e1/0x300 [ 100.269319][ T5321] check_noncircular+0x12e/0x150 [ 100.269333][ T5321] __lock_acquire+0x1520/0x2cf0 [ 100.269353][ T5321] ? __lock_acquire+0x13e8/0x2cf0 [ 100.269370][ T5321] ? __pfx_stack_trace_save+0x10/0x10 [ 100.269384][ T5321] ? tcm_alloc+0x21/0x2e0 [ 100.269396][ T5321] lock_acquire+0x106/0x350 [ 100.269411][ T5321] ? tcm_alloc+0x21/0x2e0 [ 100.269427][ T5321] __mutex_lock+0x19d/0x1550 [ 100.269443][ T5321] ? tcm_alloc+0x21/0x2e0 [ 100.269456][ T5321] ? trace_contention_end+0x3d/0x140 [ 100.269469][ T5321] ? __mutex_lock+0x30d/0x1550 [ 100.269483][ T5321] ? tcm_alloc+0x21/0x2e0 [ 100.269496][ T5321] ? __pfx___mutex_lock+0x10/0x10 [ 100.269512][ T5321] ? __pfx___mutex_lock+0x10/0x10 [ 100.269529][ T5321] tcm_alloc+0x21/0x2e0 [ 100.269542][ T5321] usb_get_function+0x63/0xb0 [ 100.269555][ T5321] config_usb_cfg_link+0x148/0x260 [ 100.269572][ T5321] configfs_symlink+0x59a/0x1030 [ 100.269584][ T5321] ? lookup_one_qstr_excl+0x1d4/0x360 [ 100.269599][ T5321] ? make_vfsuid+0x49/0xa0 [ 100.269612][ T5321] ? __pfx_configfs_symlink+0x10/0x10 [ 100.269624][ T5321] ? bpf_lsm_inode_symlink+0x9/0x20 [ 100.269644][ T5321] vfs_symlink+0x18b/0x330 [ 100.269656][ T5321] ? security_path_symlink+0xfd/0x360 [ 100.269671][ T5321] filename_symlinkat+0x1cd/0x410 [ 100.269682][ T5321] ? __pfx_filename_symlinkat+0x10/0x10 [ 100.269692][ T5321] ? do_getname+0x151/0x250 [ 100.269703][ T5321] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.269715][ T5321] __se_sys_symlinkat+0x4e/0x2b0 [ 100.269727][ T5321] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.269737][ T5321] do_syscall_64+0x174/0x580 [ 100.269751][ T5321] ? trace_irq_disable+0x3b/0x140 [ 100.269765][ T5321] ? clear_bhb_loop+0x40/0x90 [ 100.269778][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.269789][ T5321] RIP: 0033:0x7f35a399e019 [ 100.269801][ T5321] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 100.269810][ T5321] RSP: 002b:00007f359fdf4fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 100.269822][ T5321] RAX: ffffffffffffffda RBX: 00007f35a3c25fa0 RCX: 00007f35a399e019 [ 100.269831][ T5321] RDX: 0000200000000500 RSI: ffffffffffffff9c RDI: 0000200000000440 [ 100.269840][ T5321] RBP: 00007f35a3a3500c R08: 0000000000000000 R09: 0000000000000000 [ 100.269848][ T5321] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 100.269855][ T5321] R13: 00007f35a3c26038 R14: 00007f35a3c25fa0 R15: 00007ffd99742bc8 [ 100.269868][ T5321] [ 100.396118][ T24] audit: type=1800 audit(1785849952.957:5): pid=5322 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4286 res=0 errno=0 [ 100.403068][ T24] audit: type=1800 audit(1785849952.957:6): pid=5322 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4287 res=0 errno=0 [ 100.410402][ T24] audit: type=1800 audit(1785849952.977:7): pid=5322 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4288 res=0 errno=0 [ 100.655210][ T10] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 100.806143][ T10] usb 5-1: Dual-Role OTG device on HNP port [ 100.814840][ T10] usb 5-1: New USB device found, idVendor=1d6b, idProduct=0104, bcdDevice= 7.02 [ 100.820387][ T10] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0